Tool-holder.



APPLICATION FILED AUG. 19, 1910.

DEB.

Patented July 4, 1911.

' ATTORNEY HAROLD FISH, OF STRATFORD, CONNECTICUT.

TOOL-HOLDER.

Specification of Letters Patent.

Application filed August 19, 1910.

Patented, July 4, 1911. Serial No. 578,021.

To all whom it may concern:

Be it known that I, HAROLD FIsH, a citizen of the United States,residing at Stratford, county of Fairfield, State of Connecticut, haveinvented an Improvement in Tool- Holders, of which the following is aspecification.

This invention has for its object to provide a simple and inexpensivetool holder which is adapted to carry the various styles of tools usedupon lathes, planers and shapers, which may be easily and quicklyoperated to grip or release a tool and which will hold either angular orround-shank tools with absolute rigidity so that they can not be movedunder the severest strains of use.

With these and other objects in view I have devised the novel toolholder which I will now describe, referring to the accompanying drawingforming a part of this specification and using reference characters toindicate the several parts:

Figure 1 is a longitudinal section of the body of my novel tool holdershowing the set screw, plunger, wedge blocks and tool in elevation; Fig.2 a section on the line 22 in Fig. 1, looking in the direction of thearrows; Fig. 3 a longitudinal section corresponding with Fig. 1 andshowing a variant form of the invention; Fig. 4 a view partly inelevation and partly in longitudinal section, illustrating anothervariant form of the invention, which is especially adapted for metalshapers; and Fig. 5 a section on the line 55 in Fig. 4, looking in thedirection of the arrows.

10 denotes the body of my novel tool holder which is provided at itsforward end with a recess 11, with inclined rear walls, which receivesthe tool, indicated by 12, and wedge blocks, indicated by 18, which areprovided .with correspondingly inclined rear walls. It is of courseimmaterial so far as the principle of the invention is concerned,whether the tool is set transversely to the longitudinal plane of thebody as in Fig. 1, or obliquely thereto as in Figs. 3 and 4.

In Figs. 1 and 8 I have illustrated a square-shanked boring tool carriedat different angles and in Fig. 4 I have illus trated a diamond-pointtool carried obliquely to the longitudinal plane of the body. Theoperative faces of the wedge blocks may be made flat, as in Figs. 1 and3, or may be provided with recesses 14 variously shaped to receive roundor angular shanks of tools, as in figure 4. In order to prevent thewedge blocks from dropping out when there is no tool in the holder, Iretain them loosely therein by means of pins 15 which engage the holderwith a drive fit and pass through relatively large holes 16 in the wedgeblocks so that while the wedge blocks are retained securely in place inthe body they are free to move in the recess in gripping or releasing atool. In Figs. 1 and 3, I have shown the wedge blocks as provided attheir rear ends with inclines 17 which are engaged by correspondinginclines at the forward end of a plunger 18 lying in a longitudinal hole19 in the body. At the rear end of the body is a set screw 20, the innerend of which is adapted to engage the outer end of the plunger and forceit into engagement with the inclines on the wedge blocks, theefl'ect ofwhich is to cause the operative faces of the wedge blocks to bear theirentire length upon the tool and to crowd the tool against the wall ofthe recess, the wedge blocks being forced apart by the plunger and beingwedged between the contiguous walls of the recess and the tool, so thatstrain upon the tool is taken up by what is practically a solid mass ofmetal. In other words, strain upon the tool in use is transmitted to thewedge blocks with a wedging action and is taken up by the wedge blocks,the body and the plunger.

In the form illustrated in Fig. 4, the action is substantially the samealthough the construction differs in details. The longitudinal holes inthe body and the plunger are dispensed with. The body is provided with ahead 21 and the set screw 22 is provided with a conical point 23 whichengages correspondingly-shaped recesses in the rear ends of the wedgeblocks which take the place of the inclines in the other forms.

The operation will be obvious from the drawing. When the set screw isturned slightly backward so that neither the plunger in the first andsecond forms nor the conical point of the set screw in the third formbears upon the wedgeblocks, the latter are quite loose and a tool may bereadily inserted or removed, the wedge blocks, however, being retainedin the recess in the body by means of the pins. Having placed a tool inposition, the set screw is turned in tightly and either the plunger orthe conical head of the screw, if that form is used, will crowd thewedge blocks apart, wedging them between the shank of the tool and theinclined walls of the recess in the body, locking the tool rigidly inplace.

Having thus described my invention I claim: 7

1. A tool holder comprising a body having a recess with inclined rearwalls, which is adapted to receive the shank of a tool, wedge blocks insaid recess and means for crowding said wedge blocks apart and causingthem to engage the walls of the recess and the shank of the tool with awedging action.

2. A tool holder comprising a body having a recess with inclined rearwalls, which is adapted to receive the shank of a tool, wedge blocks,means for loosely retaining the wedge blocks in the recess and means forcrowding said wedge blocks apart and causing them to engage the walls ofthe recess and the shank of the tool with a wedging action.

3. A tool holder comprising a body having a recess with inclined rear'walls, which is adapted to receive the shank of a tool,

wedge blocks in said recess, a plunger engaging the wedge blocks tocrowd them apart and a set screw for moving the plunger forward.

4. A tool holder comprising a body having a recess with inclined rearwalls which is adapted to receive the shank of a tool, wedge blockshaving inclines at their rear ends, a plunger having correspondinginclines and means for forcing the plunger forward, for the purpose setforth.

5. A tool holder comprising a body having a recess with inclined rearwalls, which is*adapted to receive the shank of a tool, wedge blocks insaid recess having holes through them, pins passing through said holesloosely and engaging the body, for the purpose set forth, and means foractuating the wedge blocks to lock atool in the holder.

In testimony whereof I affix my signature in presence of two witnesses.

HAROLD FISH.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

